[coreboot-gerrit] Patch set updated for coreboot: 2ef0f7c arm64: add midr_el1 accessor function

[Patrick Georgi (pgeorgi@google.com)]

Patrick Georgi (pgeorgi at google.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/9032

-gerrit

commit 2ef0f7caa8fa27157cd7168392fe5780c8d4056e
Author: Aaron Durbin <adurbin at chromium.org>
Date:   Wed Sep 3 13:19:46 2014 -0500

    arm64: add midr_el1 accessor function
    
    Provide access to the MIDR_EL1 register to obtain the
    main id for determining CPU implementer and part/revision
    information.
    
    BUG=chrome-os-partner:31761
    BRANCH=None
    TEST=Built and printed the output of this function on ryu.
    
    Change-Id: I42cec75072fc5e8b48f63c1971840fdc415e4326
    Signed-off-by: Patrick Georgi <pgeorgi at chromium.org>
    Original-Commit-Id: ad19ffe629d9f16b8fd07051ce73533e97fb3f5c
    Original-Change-Id: I8b8506ebff8e6f9d7c4f96d7ff7e21803972961e
    Original-Signed-off-by: Aaron Durbin <adurbin at chromium.org>
    Original-Reviewed-on: https://chromium-review.googlesource.com/216423
    Original-Reviewed-by: Furquan Shaikh <furquan at chromium.org>
---
 src/arch/arm64/armv8/lib/sysctrl.c              | 10 ++++++++++
 src/arch/arm64/include/armv8/arch/lib_helpers.h |  1 +
 2 files changed, 11 insertions(+)

diff --git a/src/arch/arm64/armv8/lib/sysctrl.c b/src/arch/arm64/armv8/lib/sysctrl.c
index deb991f..2737f56 100644
--- a/src/arch/arm64/armv8/lib/sysctrl.c
+++ b/src/arch/arm64/armv8/lib/sysctrl.c
@@ -522,6 +522,16 @@ void raw_write_mair_current(uint64_t mair)
 	SWITCH_CASE_WRITE(raw_write_mair,mair);
 }
 
+/* MIDR */
+uint32_t raw_read_midr_el1(void)
+{
+	uint32_t midr_el1;
+
+	__asm__ __volatile__("mrs %0, MIDR_EL1\n\t" : "=r" (midr_el1) :  : "memory");
+
+	return midr_el1;
+}
+
 /* MPIDR */
 uint64_t raw_read_mpidr_el1(void)
 {
diff --git a/src/arch/arm64/include/armv8/arch/lib_helpers.h b/src/arch/arm64/include/armv8/arch/lib_helpers.h
index 8c6198f..723fc15 100644
--- a/src/arch/arm64/include/armv8/arch/lib_helpers.h
+++ b/src/arch/arm64/include/armv8/arch/lib_helpers.h
@@ -214,6 +214,7 @@ uint64_t raw_read_mair_el3(void);
 void raw_write_mair_el3(uint64_t mair_el3);
 uint64_t raw_read_mair_current(void);
 void raw_write_mair_current(uint64_t mair);
+uint32_t raw_read_midr_el1(void);
 uint64_t raw_read_mpidr_el1(void);
 uint32_t raw_read_rmr_el1(void);
 void raw_write_rmr_el1(uint32_t rmr_el1);